I don't know if this is considered common knowledge here, but I just wanted to share my 0.02 regarding LTC for new traders.
Litecoin was one of the first alt-coins ever developed after Bitcoin, and is generally seen as it's more liberal little brother. Because of its smaller risk and market cap, Litecoin is able to move more freely (2-3 minute block confirmations), explore alternate ideas (Proof-of-Stake), and implement emerging technologies at a faster pace (like adopting Segwit). If Bitcoin were digital gold, Litecoin would be silver.
In turbulent periods, LTC/BTC move somewhat asynchronously and can be hard to predict. But when BTC blasts-off it will often leave LTC behind, and when the market cools down LTC will always try to catch up. This relationship has been very consistent for many years.